WLED-x4
32º viewing angle - tight - projects the light mostly forward.
WLED-x5
220º viewing angle - wide - projects light out forward and to sides. If used in a 2006/2007 headlamp housing, it fills the housing, for example.
If fender side marker lamp is stock, then lense will diffuse light -- this would be a good choice. Can also use -x4 or -x6
If fender side marker lamp is clear (not diffused -- you can see bulb clearly), then use either WLED-x4 or -x6.
WLED-x6
35º viewing angle - tight - projects the light mostly forward, with some side projection. If used in a 2006/2007 headlamp housing, it will fill the housing, but less so, but light projected is brighter -- more LED's more light (more flags, more fun).
NOTE: the "x" as in "x5" for example, stands for the color you want.
So, if ordering an amber bulb, then you would purchase, for example, WLED-A5.